A destructive earthquake (Mw 6.8) occurred at Sivrice-Elazığ on the East Anatolian Fault Zone (EAFZ) on 24th January, 2020, causing loss of life and property. During the period of historical and instrumental seismology, destructive earthquakes have occurred at certain periodic intervals on the EAFZ, and micro-earthquake activity is also a frequent tectonic event. In this study, time-dependent four-dimensional tomography images of the Hazar-Sincik segment, one of the six segments of the EAFZ that produced the Sivrice earthquake, were obtained for the first time using the local earthquake tomography method. Synthetic tests show that data sets from before and after the Sivrice earthquake can produce reliable results in the Hazar-Sincik segment up to 20 km deep. Low V_p and V_p/V_s values were observed before the Sivrice earthquake, and an increase in V_p/V_s rates was detected after the Sivrice earthquake. Low V_p and V_p/V_s values along the Bitlis-Zagros Thrust Belt indicate that this area may present a high earthquake hazard. Very low V_p velocities on the Erkenek segment, which has produced destructive earthquakes in the past make us think that this region is still loaded with stress and that potential earthquakes in the future are likely. The results show that V_p and V_p/V_s characteristics change radically after a major earthquake. The reasons for these changes include the evolution of underground porosity and permeability values after major earthquakes. Detecting the area of seismological changes underground with time-dependent four-dimensional tomographic images can provide an important basis for earthquake prediction research.

2020年1月24日，东安纳托利亚断层带（EAFZ）的Sivrice-Elazığ发生了破坏性地震（Mw 6.8），造成人员伤亡和财产损失。在历史和仪器地震学时期，EAFZ上每隔一定的时间间隔就发生破坏性地震，微地震活动也是一个频繁发生的构造事件。在这项研究中，首次使用局部地震层析成像方法获得了哈扎尔－辛奇克（Hazar-Sincik）片段的时间相关的二维层析图像，该片段是EAFZ发生西弗里斯地震的六个片段之一。综合测试表明，西维奇地震前后的数据集可以在长达20 km的哈扎尔-辛奇克（Hazar-Sincik）段中产生可靠的结果。低V _p和V _p/ V _s值在西弗里斯地震之前被观测到，而在Sivrice地震后发现V _p / V _s比率增加。沿Bitlis-Zagros推力带的V _p和V _p / V _s值较低，表明该地区可能有很高的地震危险。过去曾造成破坏性地震的Erkenek段的V _p速度非常低，这使我们认为该地区仍然充满压力，未来可能发生地震。结果表明，V _p和V _p大地震后，/ V_的特性发生根本变化。这些变化的原因包括大地震后地下孔隙度和渗透率值的演变。随时间变化的二维断层图像检测地下地震变化区域，可以为地震预测研究提供重要依据。